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How to test if string exists in file with Bash?
...put. Exit immediately with zero status if any match is found, even if an error was detected. Also see the -s or --no-messages option.
Error handling
As rightfully pointed out in the comments, the above approach silently treats error cases as if the string was found. If you want to handle errors ...
Can you configure log4net in code instead of using a config file?
...t;DummyTypeForLog4Net>
let logger = LogManager.GetLogger(aType)
logger.Error(new Exception("exception test"))
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What special characters must be escaped in regular expressions?
...lasses (same as PCRE):
.^$*+?()[{\|
Escaping any other characters is an error with POSIX ERE.
Inside character classes, the backslash is a literal character in POSIX regular expressions. You cannot use it to escape anything. You have to use "clever placement" if you want to include character c...
range() for floats
...robust. If you do it directly with floats, you risk having strange one-off errors due to how floats are represented internally. For instance, if you try list(frange(0, 1, 0.5)), it works fine and 1 is excluded, but if you try list(frange(0, 1, 0.1)), the last value you get is close to 1.0, which is ...
Get host domain from URL?
how to get host domain from a string URL?
9 Answers
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Create PostgreSQL ROLE (user) if it doesn't exist
...e an SQL script to create a ROLE in PostgreSQL 9.1, but without raising an error if it already exists?
10 Answers
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SecItemAdd and SecItemCopyMatching returns error code -34018 (errSecMissingEntitlement)
...on on device from Xcode I would try to access the keychain but fail due to error -34018. This doesn't match any of the documented keychain error codes and can't be consistently reproduced. (happens maybe 30% of the time, and it's not clear to me why it happens). What makes debugging this problem ver...
Is it .yaml or .yml?
According to yaml.org , the official file extension is .yaml .
4 Answers
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Is file append atomic in UNIX?
In general, what can we take for granted when we append to a file in UNIX from multiple processes? Is it possible to lose data (one process overwriting the other's changes)? Is it possible for data to get mangled? (For example, each process is appending one line per append to a log file, is it po...
记一次MongoDB性能问题 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
记一次MongoDB性能问题最近忙着把一个项目从MySQL迁移到MongoDB，在导入旧数据的过程中，遇到了些许波折，犯了不少错误，但同时也学到了不少知识，遂记录下来。公...最近忙着把一个项目从MySQL迁移到MongoDB，在导入旧数据的过...